The 47-year-old singer attended the annual event on Sunday, where she stunned in a glamorous black Dolce & Gabbana dress while supporting the Time's Up initiative. Carey -- who was nominated for a Golden Globe for Best Original Song for "The Star" from the animated film of the same name, but lost to "This Is Me" from The Greatest Showman -- tweeted about her experience throughout the night, including accidentally stealing Meryl Streep's seat.

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"Got caught mingling on the way to the loo during a commercial break.. took the first seat available, happens to be right next to Steven Spielberg," she tweeted. "Cut to next commercial break, guess who comes back to her seat... (me) Dear Meryl, please forgive me!!! (MERYL STREEP) You can take my seat any time!"

Got caught mingling on the way to the loo during a commercial break.. took the first seat available, happens to be right next to Steven Spielberg 😮😮 Cut to next commercial break, guess who comes back to her seat...

And she was quite the hit on the red carpet, posing with fellow A-listers Emma Stone, Natalie Portman, America Ferrera and tennis legend Billie Jean King.

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ET spoke to Carey on Sunday, where she talked about supporting Time's Up when it comes to the music industry.

"Of course it's important for me to support the movement, there's no way I couldn't," she said. "I had a few conversations with Kerry Washington, just talking about the whole thing. And even in the music business, we haven't even touched on that ball of wax. But I think I need to be a consultant when it's time to talk about that."

ET also spoke to actress Tracee Ellis Ross, who talked about why she felt empowered to wear a turban on the red carpet.